('CID100000983', 2),triphospate
('CID100000983', 2),TRIPHOSPATE
('CID100072187', 1),AZT-triphospate
ldiff: defaultdict(<type 'list'>, {'CID100000983': [0, 0], 'CID100072187': [4]})
f1: [0, 0]
f2: [4]
c1: Counter({0: 2})
c2: Counter({4: 1})
The chosen was ... CID100000983